HVDC light transmission system with fuzzy logic based PI controller

Abstract

In the recent times there are many advancements in the sector of power electronic equipment. HVDC transmission system is further developed into HVDC light transmission system by replacing of thyristor valves with IGBT valves. There are a lot of advantages with HVDC light system compared to normal HVDC. When HVDC light transmission is confronted with fault, then the voltage and current vary, and they takes more time to come back to their steady state with PI controller. In this paper fuzzy logic based PI controller is proposed to reduce the time to reach their normal state, and improve the system steady state. The recommended controller is compared with traditional PI (proportional integral) controller for different control requirements, DC voltage, and reactive power under sudden disturbances such as three phase to ground fault. The performance of HVDC light system with traditional PI and fuzzy-PI shall be tested on under three-phase faults using MATLAB-Simulink software.